basically the decrease in sensitivity is your body becoming accustomed to the feel of the masturbation, which makes it less intense. This is also likely why you are having trouble orgasming with your girlfriend. You have become accustomed to this one way of orgasming, so a new way is just not doing it for you. I'm guessing you probably stroke rather fast when masturbating, and that speed is hard to match while engaging in sexual intercourse.
I am currently trying to deal with the same problem you are. The first time I was able to orgasm from sex it was because my girlfriend kept prodding me to go faster until finally i was at about the speed a rabbit humps, and was able to orgasm. I tried abstaining from masturbation for a bit, and found it much easier to cum from sex. Unfortunately I am currently also having that problem where it just doesn't feel right if i don't masturbate; this campus is full of extremely hot women, and i just feel like i'll burst if i don't masturbate at least once a day.
vagabondprince
Posted: 02 Oct 20:03